Fix XDG icons in message dialogs again

My bad, I overlooked the icon change when reviewing the changes in #114
(9129a63)

Originally patched in #113 (a42ef19)

PKGBUILD

@@ -11,7 +11,7 @@ _gtkver=3.24.48
 pkgbase=gtk3-classic
 pkgname=($pkgbase)
 pkgver=${_gtkver}
-pkgrel=1
+pkgrel=2
 pkgdesc="Patched GTK+3 that provides a more classic experience"
 url="https://github.com/lah7/gtk3-classic"
 conflicts=(
@@ -142,7 +142,7 @@ sha256sums=('ecbf69e66a073cbcf23454ae1ab366beedae6e96582975ae55964b0cc7bab685'
             '9785368d56b851e52de00eec852fc56f636dbc66d53c74d9b102e7c060f69533'
             '760bd3d65b3c5c0be19311d3b9d2be1f33c3bec198bc470de5afe23f5d488b8f'
             '736821182ac014617006e9d00fafa807a19611f3a9032133dee91b4656b7980a'
-            'e4cb9fdcf4318e30310a89b957a3f4de0dff04935c857a0c8afe9810ab53b529'
+            '86cee1327989457b419527d4451737233be4d4b06e1cc56c92df917b70b13ee8'
             'db82bc4647eda7cc102590d5cfffd8524cf126a704358096e0e66f5c068fe46f'
             '24217b43a7ca5bd46ff205b8f2a7c5a5192cafc36f5093255ed9053e5496afed'
             '940638221f69f89e758044c37d40e2c39a14eb479afe6046c0e7e78c061e8ca2'

appearance__message-dialogs.patch

@@ -60,22 +60,22 @@ Index: b/gtk/gtkmessagedialog.c
    {
    case GTK_MESSAGE_INFO:
      name = _("Information");
-+      icon = "gtk-dialog-info";
++    icon = "dialog-info";
      break;
 
    case GTK_MESSAGE_QUESTION:
      name = _("Question");
-+      icon = "gtk-dialog-question";
++    icon = "dialog-question";
      break;
 
    case GTK_MESSAGE_WARNING:
      name = _("Warning");
-+      icon = "gtk-dialog-warning";
++    icon = "dialog-warning";
      break;
 
    case GTK_MESSAGE_ERROR:
      name = _("Error");
-+      icon = "gtk-dialog-error";
++    icon = "dialog-error";
      break;
 
    case GTK_MESSAGE_OTHER: